<?php $array = array('768667', '732533', '763637','784556'); function array_count($array, $index ) { $result = 0; foreach($array as $element) { if ($element === $index) ++ $result; } return $result; } $indexs = array (); $final = ''; foreach($array as $index ) { for($tmp = 0 ; $tmp < 6 ; $tmp ++) { $indexs[$tmp][] = $index[$tmp]; } } foreach($indexs as $element) { $search = 0; $result = ''; foreach($element as $index) { if($search < array_count($element, $index)) { $result = $index; $search = array_count($element, $index); } } $final .= $result; } echo $final;